Last edited by Tygolrajas
Thursday, January 30, 2020 | History

2 edition of Seismic and dynamic qualification of safety related electrical and mechanical equipment found in the catalog.

Seismic and dynamic qualification of safety related electrical and mechanical equipment

M. Subudhi

Seismic and dynamic qualification of safety related electrical and mechanical equipment

  • 82 Want to read
  • 8 Currently reading

Published by Division of Engineering, Office of Nuclear Reactor Regulation, U.S. Nuclear Regulatory Commission in Washington, D.C .
Written in English

    Subjects:
  • Nuclear power plants -- United States -- Earthquake effects.,
  • Nuclear power plants -- United States -- Electronic equipment.,
  • Nuclear power plants -- United States -- Equipment and supplies.,
  • Nuclear power plants -- United States -- Safety measures.

  • Edition Notes

    Statementprepared by M. Subudhi, J. Curreri, M. Reich.
    ContributionsCurreri, J., Reich, M., U.S. Nuclear Regulatory Commission. Office of Nuclear Reactor Regulation. Division of Engineering., Brookhaven National Laboratory. Dept. of Nuclear Energy.
    The Physical Object
    Paginationxi, 53 p. :
    Number of Pages53
    ID Numbers
    Open LibraryOL15338332M

    This report summarizes the work accomplished on USI A The general requirement is that the equipment being qualified should be subjected to several OBE tests typically five or less followed by one SSE test. An industry requirement for third-party accredited listing of seismic certificates is essential in establishing a legitimate certification process that will require all manufacturers to play by the same rules, providing risk protection and peace of mind to the building owner. The electrical contractor must be aware of any seismic requirements on projects that it is bidding on, which includes how these requirements will need to be met and who will inspect and approve the installation.

    Explicit seismic qualification should be required only if seismic experience data or existing test data on similar components cannot be shown to apply. To view, print and study the course document, please click on the following link s : Installing Seismic Restraints for Electrical Equipment 1. As a result, the State of California began to require that hospitals be built to remain operational after an earthquake. The purpose of the ICC is to provide the minimum requirements for protecting building occupants from fire and other hazards as well as to safeguard emergency personnel during emergency operations. This paper presents the results of progress in this project through May Over the past decade, concern for those areas of the country that have always had the potential for a devastating earthquake—but rarely exhibited seismic activity—have increased.

    In addition, the only equipment available to be shake table testing which is similar to the item being qualified is typically the nuclear plant component itself. As a consequence of this review, the Nuclear Regulatory Commission NRC focused its attention on the environmental and seismic qualification of the industry's electrical and mechanical equipment. The U. For each SRS analysis frequency it compares the standard deviation of the time-interval SRS amplitudes against user-defined limits. A thorough review of all safety related systems in commercial nuclear power plants was prompted by the accident at the Three Mile Island Nuclear Power Plant.


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Seismic and dynamic qualification of safety related electrical and mechanical equipment book

In addition, the only equipment available to be shake table testing which is similar to the item being qualified is typically the nuclear plant component itself. The focus of the paper is to identify the staff concern and illustrate the resolution between the NRC staff and an applicant on the seismic qualification of equipment by testing, in particular for equipment to be installed in hard-rock high frequency sites, to meet the regulatory requirements.

Several other A tasks serve to support the use of an experienced data base.

Sites are Temporarily Down

The quiz will be based on this FEMA publication. How Does it Work The IBC requires a certificate of compliance from equipment manufacturers verifying that the product they supply will withstand the design seismic load for that project or building.

The suggested methods for performing this test are better defined than the frequency content tests. The Phase II research methodology, evaluation, results, conclusions, and recommendations are described in the report. As a result, building owners, code officials, insurance carriers and other stakeholders are now adopting and enforcing seismic requirements for MEP systems—in addition to structural systems—in areas where none existed before.

The only restraints shown in these tables and drawings are those needed to provide the extra support for seismic loads. A typical earthquake will usually begin with small vibrations that increase over a few seconds until it enters a period of strong motion lasting between 10 to 15 seconds.

For each SRS analysis frequency it compares the standard deviation of the time-interval SRS amplitudes against user-defined limits. To view, print and study the course document, please click on the following link s : Installing Seismic Restraints for Electrical Equipment 1.

After 8 years of studies and data collection, the NRC issued its Generic Safety Evaluation Report'' approving an alternate seismic qualification approach based on the use of seismic experience data.

As a result, the State of California began to require that hospitals be built to remain operational after an earthquake.

The combination of the SDC and Ip will determine whether or not the electrical contractor will need to install seismic anchors, supports or restraints for particular electrical equipment in accordance with ASCE Chapter For example, the emergency and legally required standby systems required by Articles and of the National Electrical Code NEC would probably be assigned an Ip of 1.

As a consequence of this review, the Nuclear Regulatory Commission NRC focused its attention on the environmental and seismic qualification of the industry's electrical and mechanical equipment.

Sign In. A thorough review of all safety related systems in commercial nuclear power plants was prompted by the accident at the Three Mile Island Nuclear Power Plant. Wyoming Course Highlights This online engineering PDH course provides guidelines on how to attach Electrical equipment to a building to minimize earthquake damage.

Seismic requirements for electrical installations are being encountered by electrical contractors in parts of the United States that previously were not considered earthquake prone even though the geological potential for earthquakes exists just like on the West Coast.

Unfortunately it is quite possible to generate an excitation waveform that meets the RRS requirements but whose time history might not possess the correct spectral content in terms of frequency range, amplitude or consistency throughout its duration, or whose motions in all three axes are not independent of one another.

EARTHQUAKE ENGINEERING IN BRITAIN

The purpose of this manual is to provide a flexible set of guidelines that accommodates all parts of the country.the seismic performance of equipment, both mechanical and electrical, could be gained by a systematic study of data collected following large earthquakes and seismic testing.

This led to several initiatives in the commercial nuclear industry to apply experience data for the seismic qualification of mechanical and electrical equipment. Effects of the Excitation Level on the Dynamic Characteristics of Electrical Cabinets of Nuclear Power Plants for seismic qualification of electrical instruments.

inside safety-related. “Seismic and Dynamic Qualification of Mechanical and Electrical Equipment.” The need for a reassessment of the seismic capability of equipment in older operating plants that did not undergo the present requirements was identified as Unresolved Safety Issue A (Seismic Qualification of Equipment in Operating Plants) by the NRC in December.

Active safety related mechanical components are those which undergo mechanical motion to perform a safety function. The overall objective of the study is to recommend appropriate methods and realistic criteria for the environmental, seismic and dynamic qualification of active mechanical components.

new field and analysis of seismic safety of mechanical equipment is a complex task. The complexity increases with the increased size of the mechanical system and the task becomes even more tedious if the seismic qualification is required for Nuclear Power Plant where safety requirements are very atlasbowling.com: A.

K. Singh, K. G. Bhatia. “ Seismic Code Changes for Electrical Equipment” With the basis of the California Building Code changing this year from the UBC to the International Building Code, the design professional is faced with landmark changes on how to establish and verify seismic specification requirements for electrical and mechanical equipment.